The best replacement for head and shoulders is selsun blue.

The best alternatives to head and shoulders are rated as following:
★★★★★  selsun blue
★★★★  pantene
★★★  nizoral
★★★  t gel
★★★  clear
★★  dove
★★  equate
★★  selsun
★★  clear shampoo
★  garnier
★  sunsilk
★  suave
★  clinic all clear
★  herbal essences
★  garnier fructis
★  neutrogena t gel
★  axe shampoo
★  herbal essence
  selson blue
  tea tree shampoo
  selsun blue better
  pert plus

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Speaking about head and shoulders, one probably shouldn't forget about troy polamalu.

Other search terms related to head and shoulders and their ratings are:
★★★★★ troy polamalu
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head and shoulders
selsun blue
pantene